Epics 4 pvd::shared-vector , Can't freeze non-unique vector

[Heinz Junkes via Tech-talk <tech-talk@aps.anl.gov>]

I don't think I understand the shared vectors thing yet
and I can't get any further here.

I defined 

 epics::pvData::shared_vector<double> xData, yData;

Populate vector like
  
xData.push_back(vCh[1][i] - vCh[0][i]);
yData.push_back(vCh[2][i] - vCh[3][i]); 

Then call

 ClPut->put(counter, xData, yData);


Is defined 

void put(long long val, shared_vector<double> xData, shared_vector<double> yData)
    {
…

Here I am doing

PVDoubleArrayPtr pvDoubleArray = static_pointer_cast<PVDoubleArray>(pvField); 
          
pvDoubleArray->replace(freeze(xData));

But this leads to :

		Can't freeze non-unique vector

When I use 

pvDoubleArray->swap(freeze(xData));

This leads to compile error:
../iChunk.h: In member function 'void ClientPut::put(long long int, epics::pvData::shared_vector<double>, epics::pvData::shared_vector<double>)':
../iChunk.h:188:53: error: cannot bind non-const lvalue reference of type 'epics::pvData::PVValueArray<double>::const_svector& {aka epics::pvData::shared_vector<const double>&}' to an rvalue of type 'epics::pvData::shared_vector<const double>'
              pvDoubleArray->swap(freeze(xData));

Danke,
Heinz

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